Lens-holder



S, G. MARSHALL.

LENS HOLDER.

APPLICATION FILED MAY 21,1919.

Patented Apr. 13, 1929.

UNITED STATES PATENT OFFIGE.

STANLEY G. MARSHALL, 0F HEBBRONVILLE, TEXAS.

LENS-HOLDER.

Application filed May 21, 1919.

To all whom it may concern:

Be .it known that I, STANLEY G. MARsHALL, a citizen of the United Statesof America, residing at Hebbronville, in the county of Jim Hogg andState of Texas, have invented new and useful Improvements inLens-Holders, of which the following is a specification.

The object of the invention is to provide a simple, relativelyinexpensive and efficient means whereby a lens may be seated and securedin place in a lamp casing of the type for example used in connectionwith automobile head and side lights. to insure the fastening of thesame against vibration and displacement while permitting the removalthereof when required for cleansing and substitution.

Further objects and advantages of the invention. will appearhereinafter, it being understood that changes in form and proportionsmay be resorted to within the scope of the claim without departing fromthe principles involved.

In the drawings;

Figure l is a sectional view of a lamp casing provided with a lenssecuring device constructed in accordance with the invention.

Fig. 2 is a transverse sectional view on the plane indicated by the line2-2 of Fig. 1.

Fig. 3 is a detail sectional view through one of the cam tongues asindicated by the line of Fig. 2.

lVithin a casing 10 which may be of the ordnary or any preferred typeand is provided vith the usual reflector 11 and lens cap 12 having thelens seat 13, is a lens 14 between which and the lens seat is interposedan annular cushion 15., of rubber or fiber or equivalent material. Thelens 1+: is held seated by the fastening means which consists of aretainer ring 16, shown in face view in Fig. 2. This ring is adapted toexert a pressure towa rd the plane of the seat so as to clamp the lensin place thereon. Attached to and disposed in angular relation with theseat are cam tongues 17, the attachment of each tongue being at one endso as to leave the other end free and slightly deflected from the planeof the lens arranged properly upon the seat, while the retainerSpecification of Letters Patent.

Patented Apr. 13, 1920.

Serial No. 298,756.

which is of annular form, is provided at intervals corresponding withthose between said cam tongues with riders 18 designed to engage underthe free ends of the tongues and to slide back toward the points ofattachment on said tongues to the seat in order to exert the desiredpressure upon the lens to lock it in the desired position.

Preferably the tongues are of spring metal or the equivalent so as to bemore or less resilient and thusadd to the eficiency thereof in holdingthe lens by reason of pressure upon the retainer ring against vibrationunder the arring to which lamps of the type indicated are subjected inuse. Also the re tainer ring preferably consists of inner and outerannular concentric elements 19 and 20, spaced apart to form slots 21intersected at intervals by the riders 18 which serve to connect saidelements, and in applying the ring after the seating of the lens theslots between the concentric members of the former are alined with thetongues after which the ring is turned to cause the engagement andclamping action above indicated.

is a cushioning means between the re tainer ring and the lens a sheath22 may be fitted upon the inner element of the retainer ring to bearagainst the surface of the lens. It will be noted that this sheath, inaddition to its cushioning effect, may, if of rubber or similar adhesivematerial. serve effectively as a means of preventing the accidentalloosening of the retainer by jarring or otherwise, while permitting thereverse turning movement thereof to release the lens when it is desiredto remove the latter for the purpose of cleaning or for the substitutionof a lens of a different type or color.

What is claimed is:

A lamp casing having a lens seat cam tongues projecting at intervalsfrom said seat, a retainer ring consisting of inner and outer concentricelements and spaced riders connecting said elements for engagementrespect-ively with said tongues. and a frictional cushioning sheathfitted upon the inner element of the retainer ring for contact with thesurface of a seated lens.

In testimony whereof I my signature.

STnl LE Y G. MARSHALL.

